JPH0531404B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a seat reclining device that allows an optimal seating posture in an automobile.

〓Prior Art〓 Conventionally, as a seat reclining device for adjusting a desired tilted posture by tilting a seat back, for example, a device described in Japanese Utility Model Application Publication No. 59-41153 is known. As shown in FIG. 5, this device includes a base plate 101 fixed to a seat cushion A, an arm 103 fixed to a seat bag B rotatably attached to the outside of the base plate 101, and an arm 103 fixed to the seat cushion A. A lower tooth 107 that engages with a provided upper tooth 105 to hold the arm 103 at a desired rotation angle position.
And, this lower tooth 107 is the above-mentioned hot tooth 1
05 and a release operation part 109 that engages and disengages it. The arm 103 is sandwiched between the base plate 101 and the holder plate 111, and is pivotally attached to the base plate 101 via an arm shaft 113. An E-ring 1 is attached to the arm shaft 113 on the outside of the holder plate 111.
A release operation section 109 is attached via 15. Furthermore, on the outside thereof, return springs 119 are connected to the base plate 10 on the same axis as the arms 103 via washers 117.
It is attached to 1. Also, the above-mentioned Atsupatoosu 1
05 is in mesh with the lower teeth 107 under normal conditions. This lower tooth 107 has pin 12
1 between the base plate 101 and the holder plate 111, and the lower teeth 1
A cam 125 is engaged with a recess 123 provided in 07. This cam 125 is connected to the shaft 127
It is pivoted between the base plate 101 and the holder plate 111 via. A rod lever 129 is engaged with and fixed to the shaft 127 on the outside of the holder plate 111. A pin rod 131 is formed at the other end of the rod lever 129, and the rod lever 1 is connected to the shaft 127 through the pin rod 131.
Reference numeral 29 includes a lever operating portion 109 and a pin rod 131 which is fitted into a long hole 133 of the operating portion 109, and is pivoted by a retaining nut 135.

〓Problems to be solved by the invention〓 In such a seat reclining device, in order to adjust the seat back B to a desired tilted posture,
Cam 1 controlled by release operation section 109
25, the engagement between the lower teeth 107 and the upper teeth 105 is released. Next, after rotating the seat back B in a desired direction, the upper teeth 105 and the lower teeth 107 are engaged to obtain the desired tilted posture.

The teeth a and b of the upper teeth 105 and lower teeth 107 have sufficient strength to withstand the load applied to the seat back B in the event of a vehicle collision or the like. For this purpose, the teeth a and b of the upper tooth 105 and lower tooth 107 are finished with high precision and have a prescribed reference pitch.

Therefore, the final angle adjustment to restrain the desired tilted posture is set by the pitch of the teeth a formed on the top teeth 105, so for example, the rotation angle may be further finely adjusted in small increments. In order to obtain this, it is necessary to reduce the pitch of the teeth a. In this case, if the pitch of the tooth portion a was made smaller than the standard pitch, there were problems such as affecting the strength.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a seat reclining device that enables reliable engagement, provides the same strength as the conventional seat reclining device, and allows fine adjustment of the inclination angle of the seat back.

<Means for Solving the Problems> In order to achieve the above object, the present invention includes a base plate fixed to the seat cushion side, a base plate rotatably pivoted to the base plate, and a base plate fixed to the seat cushion side. an arm plate fixed to the arm plate; a pair of coaxially fixed atsupate teeth having engagement teeth formed over a predetermined area and fixed to the arm plate; A pair of lower teeth having engaging teeth that can engage with the matching teeth without interfering with each other and being pivotally mounted on the same axis, and a restraint that engages with and restrains the lower teeth when engaged, which are supported on the base plate side. The release operation part is connected to a cam plate that can be rotated between a restraint state and a restraint release state, and controls the operation of the cam plate between a restraint state and a restraint release state, and the pitch of each engaging tooth of each of the above-mentioned upper teeth is set to 1. It has a configuration in which it is shifted by /2 teeth.

〓Operation〓 In such a seat reclining device, the release operating portion releases the engagement between the upper teeth and the lower teeth via the cam, then rotates the arm plate in the desired direction, and then engages the upper teeth and the lower teeth again. Blend your teeth together. At this time, each engagement tooth of the upper tooth is offset by 1/2 tooth from each engagement tooth of the lower tooth, so the peaks of the teeth of one set face each other and are in a non-meshing state. On the other hand, the other pair is in an engaged state and the arm plates are in a restrained state. Therefore, each engaging tooth is 1/
With a pitch of 2 teeth, small adjustments are possible.
It is restrained in the desired tilted position.

Embodiment An embodiment of the present invention will be described in detail below with reference to the drawings of FIGS. 1 to 4.

FIG. 1 shows a seat reclining device R of the present invention, which includes a base plate 1
and an arm plate 5 rotatably attached to the outside of the base plate 1 via a shaft 3.
and engagement teeth 7 on the lower end side of this arm plate 5.
A pair of Atsupattooths 7, 9 having a, 9a,
A pair of lower teeth 11, 13 having engaging teeth 11a, 13a that removably engage with the engaging teeth 7a, 9a of the upper teeth 7, 9, a pair of cam plates 15 that engage with the lower teeth 11, 13,
17, and a release operation section 19 for engaging and disengaging each of the lower teeth 11, 13 from the upper teeth 7, 9 via the cam plates 15, 17.

The arm plate 5 is attached to the seat back B of the seat A, and the base plate 1 is attached to the seat cushion C, respectively, and the seat back B is always urged forward (indicated by the arrow in FIG. 1) by a return spring 21. Return spring 21
is formed in a spiral shape, and its central end 21a is secured to the shaft 3, and its outer end 21b is secured to the arm plate 5.

The upper part of the base plate 1 has an arc-shaped long hole 23.
is formed in the elongated hole 23, and a fixing pin 2, which will be described later, is inserted into the elongated hole 23.
5 faces, and the fixing pin 25 is inserted into the elongated hole 2.
3 has a stopper function to restrict the rotation range of the seat bag B.

On the other hand, a plurality of fixing pins 27 are provided outside the fixing pin 25 (on the right side in FIG. 1) at the lower part of the arm plate 5.
The pair of top teeth 7 and 9 are fixed with the separator 29 in between. As a result, a constant spacing between each of the top teeth 7 and 9 is ensured. This prevents interference from occurring when the lower teeth 11 and 13 engage with each other. Engaging teeth 7a are provided on the lower edge of one of the top teeth 7 over a predetermined area with a reference pitch P. The engagement teeth 9a of the other attachment tooth 9 installed in parallel with this attachment tooth 7 are provided over a predetermined area with a standard pitch _P1 , which is similar to the engagement tooth 7a of the attachment tooth 7 described above. but,
The pitch of each engaging tooth 7a, 9a is set to be shifted by 1/2 tooth.

The engaging teeth 7a and 9a of each atsupatotooth 7 and 9 are as follows:
By machining one of the engaging teeth to have a 1/2 tooth phase difference, the pitch is set to be shifted by 1/2 tooth. Note that the top teeth 7 and 9 should be formed with the same pitch, and the pitches should be set so that the pitches are shifted by 1/2 tooth when each of the top teeth 7 and 9 are fixed to the arm plate 5 with the respective fixing pins 25 and 27. is also possible.

The lower teeth 11, 13 include an engaging recess 11b,
13b, and is pivotally connected to the base plate 1 by two pins 30. lower tooth 11,
13, so that the engagement teeth 11a, 13a of the lower teeth 11, 13 mesh with the engagement teeth 7a, 9a of the upper teeth 7, 9,
Projections 15a, 1 of the cam plates 15, 17
7a is pressed into engagement. Cam plate 15,1
7 is connected to the release operation section 19 via an arm shaft 35 of the release operation section 19 which is pivotally connected to the holder plate 33.
9 is pivotally attached to the base plate 1. In addition, the protrusions 15 of the cam plates 15 and 17
a, 17a are urged toward the engaging recesses 11b, 13b by urging springs 31, 31, and one end of each urging spring 31, 31 is connected to each cam plate 15, 17.
The other end is locked to the base plate 1 and the holder plate 33, respectively.

The holder plate 33 is the arm plate 5
and is fixed by the shaft 3.

On the other hand, when the operating pin 37 provided on the release operating section 19 rotates upward (as indicated by the arrow in FIG.
b, 17b are placed in contact with each other.
Note that the projections 15 of the cam plates 15 and 17 are caused by the actuation pin 37 coming into contact with the projections 15b and 17b.
a, 17a resist the urging springs 31, 31 and retreat from the engaging recesses 11b, 13b.

In the seat reclining device configured as described above, in order to adjust the seat back B, the release operation section 19 is operated (see the arrow in FIG. The engagement teeth 11a, 13a of the upper teeth 7, 9 are disengaged from each other.Next, the seat bag B is rotated and set to a desired tilted posture.At this time, the engagement teeth 7a, 9a of the upper teeth 7, 9 are disengaged from each other. Engaging teeth 11a, 13a of lower teeth 11, 13
Since there is a shift of 1/2 tooth, for example, the teeth of a pair of upper teeth 9 and lower teeth 13 are in a non-meshing state with peaks. On the other hand, the other pair of upper teeth 7 and lower teeth 11 are in a state of engagement with the peaks and valleys of the teeth, and the arm plate 5
is in a restrained state. Therefore, each engaging tooth 7a, 11a and 9a, 13a that mesh with each other can be rotated in small steps with a pitch of 1/2 tooth, and an optimal tilted posture can be obtained. In this case, the engaging teeth when engaged are kept at a constant interval by the separator 29, so that they do not interfere and engage, and moreover, because of the reference pitch, they are able to engage reliably. Moreover, rigidity is also ensured.

Effects of the Invention As described above, according to the seat reclining device of the present invention, the engagement teeth of the lower teeth and the upper teeth can mesh reliably and maintain the same strength as before. Furthermore, it is possible to make fine adjustments by rotating the seat back in small increments at the time of final setting as desired, so that the optimum tilted posture of the seat back can be obtained.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view of the seat reclining device of the present invention, Fig. 2 is a side view of the reclining device, Fig. 3 is a sectional view taken along the line - - of Fig. 2, and Fig. 4 is an enlarged view of the engaging teeth of the atsupatotosu. , FIG. 5 is a schematic perspective view of a conventional reclining device. Explanation of main drawing symbols, 1... Base plate, 5... Arm plate, 7, 9... Atsupatotooth, 7a, 9a... Engagement tooth of Attsupattooth, 1
1, 13...Lower teeth, 11a, 13a...Engaging teeth of lower teeth, 15, 17...Cam plate, 19...Release operation section, B...Seat back, C...Seat cushion.

Claims (1)

[Claims] 1. A base plate fixed to the seat cushion side, an arm plate rotatably pivoted to the base plate and fixed to the seat back side, and a base plate fixed to the arm plate and shaped over a predetermined area. a pair of engaging teeth arranged in parallel; a pair of engaging teeth supported by the base plate and capable of meshing with the engaging teeth of the respective engaging teeth without interfering with each other; and a pair of coaxially pivotally connected engaging teeth. The lower tooth is connected to a cam plate that is rotatable between a restraint state and a restraint release state, which engages with the lower teeth supported on the base plate side and restrains the teeth, and the cam plate is rotated between a restraint state and a restraint release state. 1. A seat reclining device comprising: a release operation section for controlling the operation of each upper tooth;